Just after the downloading update stage reached 30% this AVG prompt appeared:AVG_26MAR16.jpg
Yikes!!!

But when I checked via "View Details" the "Trojans" were something to do with MS DOTNET 4x so most likely whatever the Win10 downloader checks on the target system triggered AVG's "Resident Shield" in this case.

Whatever, after allowing AVG to deal with the "threats" the download and subsequent installation of build 14295 proceeded without any further hiccups.